Why stay together with someone if they don't think u are the one?

My boyfriend and I have been together only a month. I asked him if thought I was a good girlfriend. He said yes and than after that he told me why. Well then at the end he added,"I like you but I don't love you sorry." I am realistic and I wasn't expecting that anyways in a month. Then he stated, "I am almost 30. I wanna settle down with a girl and have kids but unfortunately I don't think the girl is u."

After all this being said why would be still wanna be with me? I am basically got told there was no future so why should I invest more time?